Control system for light emitting device
A light-emitting device and control system technology, applied in the field of control systems, can solve problems such as time error, clock frequency difference, and large cumulative error
Inactive Publication Date: 2017-03-08
刘致明 +1
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- Abstract
- Description
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- Application Information
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Problems solved by technology
Since each oscillator has an inherent error, the clock frequency generated by it will be different, and then there will be an error in the time determined by each control device
Especially when the opening time of these artificial light sources is longer, the cumulative error of the current time determined by each control device will become larger, so that the opening and closing time of these artificial light sources will become asynchronous , thereby affecting or interfering with plant growth
Method used
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Experimental program
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Embodiment Construction
[0024] refer to figure 1 , the embodiment of the light emitting device control system of the present invention is suitable for controlling N light emitting devices 9 and includes N control devices 1 . It is characterized in that N is a positive integer. The N control devices 1 are electrically connected to the N light emitting devices 9 respectively, and are suitable for being electrically connected to an AC power source 8 . Each control device 1 includes a conversion unit 11 , a drive unit 12 , and a control unit 13 . In the following, for convenience of explanation, N=2 is taken as an example for illustration.
[0025] The AC power source 8 is a commercial power supply, and outputs an AC voltage input signal with a frequency of 50 Hz or 60 Hz and an amplitude of 110 volts or 220 volts. In addition, in this embodiment, the AC power source 8 is connected in series with a switch 7 and connected in parallel with the two control devices 1 . In other embodiments, the AC power ...
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A control system for a light emitting device comprises N light emitting devices and N control devices. Each control device includes a conversion unit, a drive unit, and a control unit. Each conversion unit receives an AC voltage input signal to produce an output signal indicative of the frequency of the AC voltage input signal. The control unit comprises M corresponding relations and determines one current time according to the frequency and a logical value of the output signal, and respectively determines M pulse width modulation signal duty ratios according to the current time and the M correspondence relations so as to produce the M pulse width modulation signals. Each driving unit controls the corresponding light emitting device to emit light according to the corresponding M pulse width modulation signals. An advantageous effect of the present invention is to provide the control system for the light emitting device for simultaneous opening and closing.
Description
technical field [0001] The present invention relates to a control system, in particular to a control system of a lighting device. Background technique [0002] Conventional artificial light sources for simulating sunlight such as aquariums and plant factories usually include a housing, an LED unit, and a control device. The light emitting diode unit and the control device are integrated in the casing, and the brightness of the light emitting diode is controlled according to a time and brightness setting table stored in advance by the control device and the current time. For example, the light-emitting diode should be controlled to emit light from five o'clock in the daytime to five o'clock in the afternoon every day, and the light-emitting diode should be controlled not to emit light from five o'clock in the afternoon to five o'clock in the morning of the next day. The known control device determines the current time according to the clock frequency generated by an oscillat...
Claims
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Login to View More IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 刘致明洪志儒
Owner 刘致明